Coffee machine



FIG. 1 is a perspective view showing an embodiment of my new design, comprising a coffee machine, shown in its closed state;

FIG. 2 is a rear perspective view of the coffee machine of FIG. 1; and,

FIG. 3 is a perspective view of the coffee machine of FIG. 1, shown in its opened state. 

The ornamental design for a coffee machine, as shown and described. 